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The links in the comments above are broken. This is still needed.

Here's our use case.

- Notify members of a call queue when a SMS message is sent to that queue

- SMS is relayed via email, but we want to relay the SMS to their RingCentral phones

- We can add outside phones using the phone number carrier options, but RingCentral is not in the carrier drop down so we cannot relay to SMS to their phones without the SMS gateway.

There does not seem to be an email to SMS gateway for RIngCentral for some reason.  I have wanted this too and seen those other threads.  That said, there may be another way to accomplish the integration you want but it would require some development to create something between your provider and the RingCentral API.

And this: https://community.ringcentral.com/ringcentral/topics/sms-ability-to-sms-from-the-ringcentral-website...

This 'Idea' is what I'm talking about: https://community.ringcentral.com/ringcentral/topics/implement-email-to-rc-sms-functionality

Thanks for trying to steer this the right direction. I thought this might just be common knowledge. Just to clarify, what I am looking for is the part after the @ in this example: 1234567890@txt.att.net. Believe it or not you can send messages to a real # like that from an email client program. Just the subdomain and domain names.
Here's more examples:
Alltel [insert 10-digit number]@ mms.alltelwireless.com
Boost Mobile [insert 10-digit number]@ myboostmobile.com
U.S. Cellular [insert 10-digit number]@ mms.uscc.net
I know those are cellular providers, but ringcentral will have a sub-domain that handles the sms messages. I just want to know if it can be sent to externally and if so what it is. Not sure how the API could help with this.

Hello!

I moved your question to our Developers Community. They should be able to better assist you. It's possible that we might be able to accomplish something like this using an API.